CHEM 1020 Saint Marys University Chemical & Physical Changes Lab Worksheet

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CHEM 1020

Saint Marys University of Minnesota

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A. Heating Solids 1.Watch the following video to observe three solids being heated to change. As you watch, pause the video as needed to observe each solid before it is heated (shown again after each heating process); as it is heated over the flame; and after it has been allowed to cool. Be descriptive and include the types of observations described in the introduction: color, texture, clarity. Then determine whether each change was chemical or physical. Provide your reasoning. 2 Watch the following video to observe the sublimation of iodine. Again, pause the video as needed to record descriptive observations of the iodine before heating; while being heated; and after cooling. Classify the change as chemical or physical and provide your reasoning. https://youtu.be/jX9pskbKSw0 B Mixing Solids with Hydrochloric Acid 1.Watch the following video to observe the first four solids being placed into hydrochloric acid. Record your observations of the initial solids, and then the solids after they have been placed in the acid. Note that some reactions are fast and some are slow. Determine whether you are observing a chemical change or no change. Provide your evidence and reasoning. (Good examples of evidence are the indications of chemical changes section of the background information, or their absence.) 2.Now, watch the following video to get the observations for the cheeseburger in hydrochloric acid. https://youtu.be/NddZ5ftQb0Q Name Chemistry 1020 Chemical & Physical Changes A. Heating Solids Compound Napthalene Copper(II) sulfate Sucrose Iodine Lab 2 | 1 Initial Observation Observation When Heated Observation When Cooled Type of Change Evidence/Reasoning B. Mixing Solids with Hydrochloric Acid Initial Observation Solid of Solid Copper metal Zinc metal Cr-coated paperclip Marble (calcium carbonate) Cheeseburger Lab 2 | 2 Observation When Mixed with HCl Did a Chemical Change Occur? Evidence/Reasoning
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Name

Chemistry 1020

Chemical & Physical Changes
A. Heating Solids
Compound

Initial Observation

Naphthalene A white solid

Copper(II)
sulfate

Sucrose

Iodine

Lab 2 | 1

Observation When
Heated

Naphthalene changes into
a vapor

Observation When
Cooled

Type of
Change

Evidence/Reasoning

Physical
change

There is no formation of a new
substance since heating
naphthalene only changes its state
from solid to gas and then back to
solid after cooling (sublimation )...

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